Start at the iliac crest (the top of your hipbone that you can feel like a shelf on the side of your body). From this level on your spine, measure to the C7 vertebrae, the knobby bone at the base of your neck when you put your head down. Make sure to keep your back straight while having the measurement taken.

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Description

Fit, function, and fantasticalness.

Osprey's Aura AG 50 Women's Backpack checks all the boxes. It fits perfectly, works well, and has just the right amount of gizmos and gadgets to keep you organized and happy without being confused or overwhelmed. It all starts with Osprey's Anti-Gravy Suspension, which uses a seamless panel of lightweight mesh that extends from the top of the back panel all the way to the hip belt, providing superior ventilation and a fit that's naturally contoured to your back. The upshot is effortless comfort and ventilation, so you can cover ground on multi-day trips without stressing about your pack.

The comfort of the Aura is boosted by the Fit-on-the-Fly hip belt, which allows seamless adjustment of the padded portion—not just the buckle straps—so it rides comfortably on all sorts of hips. Internal and external compression straps keep your load from bouncing around, and the removable lid pocket lets you size down if you're looking to travel light and quick. Osprey integrated a special sleeping bag compartment on the bottom of the Aura, included an internal reservoir sleeve, and finished the package off with a compressive FlapJacket back pocket that cinches your load down further and lets you tuck a layer away for easy access. We'd also be remiss not to mention the top and front-panel access points, which let you quickly and easily find gear no matter how deeply it's stashed away.

Here's what others have to say...

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Great pack

Familiarity:
I've used it several times

My wife used this pack on a 2 night camping/hiking trip to the summit of Mt. Whitney. It performed admirably. She carried about 25 pounds and was comfortable for the whole trip. The suspension seems to live up to all of the hype.

Comment on etf5199752's review »

Amazing!!!

Familiarity:
I've used it once or twice and have initial impressions

Used this for my first time backpacking Europe, for 25 days. It was the perfect size and fit everything I wanted to bring! I love the separate top and bottom compartments, and the zippers on the hip strap are great for small items you want to be able to find easily. My bag weighed about 23 lbs with everything in it and it felt great on! The hip strap really helped to take the weight off of my shoulders, as well as the suspension. Overall more than happy with my purchase.

Comment on Sara S.'s review »

fantasticalness is right on point

Familiarity:
I've used it once or twice and have initial impressions

if you've never felt Osprey's AG tech--get to your nearest store to try it on. It's a game changer. The 50 has less bells and whistles than the 65 (no additional side-zip pockets or sleeping pad straps) but that was no love-loss for me. I opted for the 50 so that I would be forced to pack less. Still rebounding from knee surgery I wanted to ensure I could regularly keep my pack about 30lbs and I felt this was the way to do it. This pack still has a ton of features and the ability to pack down and stay secure--at no time have I felt like the space between my back and the pack (caused by the suspension system) alters my center of gravity and makes me less stable. This pack is everything and then some. Well worth the price tag especially with Osprey's lifetime warranty.